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v in (-oo:+oo)
-2/5 = (1/2)*v-(1/3) // - (1/2)*v-(1/3)
1/3-((1/2)*v)-2/5 = 0
(-1/2)*v-2/5+1/3 = 0
-1/2*v-1/15 = 0 // + 1/15
-1/2*v = 1/15 // : -1/2
v = 1/15/(-1/2)
v = -2/15
v = -2/15
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